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Mount Prospect, Illinois 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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NWS Forecast for Mount Prospect IL
National Weather Service Forecast for:
Mount Prospect IL
Issued by: National Weather Service Chicago, IL |
| Updated: 6:16 am CDT Jun 18, 2026 |
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Today
 Mostly Sunny
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Tonight
 Mostly Clear
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Juneteenth
 Sunny
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Friday Night
 Chance Showers
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Saturday
 Mostly Sunny
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Saturday Night
 Partly Cloudy then Slight Chance Showers
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Sunday
 Showers Likely
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Sunday Night
 Chance Showers
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Monday
 Mostly Sunny
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| Hi 73 °F |
Lo 57 °F |
Hi 77 °F |
Lo 60 °F |
Hi 79 °F |
Lo 60 °F |
Hi 73 °F |
Lo 55 °F |
Hi 71 °F |
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Hazardous Weather Outlook
Today
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Mostly sunny, with a high near 73. West northwest wind 10 to 15 mph, with gusts as high as 25 mph. |
Tonight
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Mostly clear, with a low around 57. West wind 5 to 10 mph. |
Juneteenth
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Sunny, with a high near 77. West northwest wind 5 to 10 mph, with gusts as high as 15 mph. |
Friday Night
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A chance of showers before 10pm, then a chance of showers and thunderstorms between 10pm and 1am, then a slight chance of showers after 1am. Partly cloudy, with a low around 60. West wind 5 to 10 mph. Chance of precipitation is 30%. |
Saturday
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Mostly sunny, with a high near 79. West wind 5 to 10 mph, with gusts as high as 20 mph. |
Saturday Night
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A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 60. |
Sunday
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A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 73. Chance of precipitation is 60%. |
Sunday Night
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A chance of showers. Mostly cloudy, with a low around 55. |
Monday
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Mostly sunny, with a high near 71. |
Monday Night
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Partly cloudy, with a low around 53. |
Tuesday
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Mostly sunny, with a high near 76. |
Tuesday Night
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Partly cloudy, with a low around 57. |
Wednesday
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A chance of showers. Mostly sunny, with a high near 79. |
Forecast from NOAA-NWS
for Mount Prospect IL.
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Weather Forecast Discussion
387
FXUS63 KLOT 181126
AFDLOT
Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
626 AM CDT Thu Jun 18 2026
.KEY MESSAGES...
- Next significant chance of rain is Sunday with potential for
locally heavy rainfall.
&&
.DISCUSSION...
Issued at 121 AM CDT Thu Jun 18 2026
After a couple of active days, a much quieter weather pattern
expected the next few days. Northwest flow aloft will persist
with high pressure across the Ohio Valley blocking any return
moisture from the Gulf. A couple of subtle/weak perturbations in
the northwest flow will could bring some spotty showers to the
area, mainly Friday night. Coverage is expected to be on the low
side, as is confidence in it raining, so the slight chance to
chance pops offered up by the NBM seem reasonable. Temperatures
the next couple of days will be a bit below average with
comfortable dewpoints generally in the 50s.
For days now, medium range guidance has been in good agreement
in bringing a stronger shortwave trough into the Midwest late in
the weekend. By Saturday, the aforementioned surface ridge is
expected to shift eastward allowing for southerly flow from the
Gulf to advect moisture northward in advance of the next
system. There remains some latitudinal variability and
differences in guidance with respect to the track of the
associated sfc low, but there has been a pretty consistent
signal for a swath of potentially heavy rainfall setting up in
or near our CWA Sunday. Accordingly, NBM pops are quite high
and no changes were needed.
Northwest flow aloft will continue into next week. Drier
weather is expected to start the week in the wake of the Sunday
system. Next chance of showers/storms looks to be toward the
middle of next week. Temperatures next week look to remain near
to slightly below average.
- Izzi
&&
.AVIATION /12Z TAFS THROUGH 18Z FRIDAY/...
Issued at 626 AM CDT Thu Jun 18 2026
Mvfr cigs this morning.
Chance of showers this morning.
Gusty northwest winds this morning.
Mvfr cigs will continue through late morning across the
terminals and a few hours of low mvfr cigs are possible along
with a few showers or sprinkles. Cigs will slowly lift to low
vfr by early this afternoon and then scatter out this evening.
Winds are becoming northwesterly currently and will remain
northwest this morning with gusts into the lower/mid 20kt range.
These gusts will slowly diminish through the late morning and
end this afternoon as directions turn back westerly. Speeds will
diminish under 10kts with sunset this evening. cms
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...Beach Hazards Statement until 3 PM CDT this afternoon for
INZ002.
LM...Small Craft Advisory until 9 AM CDT this morning for the IL
and IN nearshore waters.
&&
$$
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